CN216354419U - Cooling structure and battery package - Google Patents

Abstract

The utility model relates to a cooling structure and a battery pack. The cooling structure includes a first cooling member and a second cooling member. When in design, the internal flow passage of the first cooling part is designed into a first flow passage and a second flow passage which are separated from each other; meanwhile, a second cooling part is arranged outside the first cooling part, at least one connecting pipe is communicated with the first flow passage, and at least one connecting pipe is communicated with the second flow passage, so that the separated first flow passage and the second flow passage are communicated under the action of the second cooling part. Namely, after the cooling liquid is introduced into the liquid inlet, the cooling liquid returns to the second flow channel through the first flow channel and the third flow channel, and is finally discharged from the liquid outlet. This application separates the design with first cooling piece internal flow channel for the coolant liquid can only accomplish the circulation with the help of outside third flow channel, and so design utilizes outside third flow channel to realize that the coolant liquid flows, is convenient for reduce the flow resistance of liquid cooling system, reduces the system pressure drop, thereby is favorable to improving the radiating effect.

Description

Cooling structure and battery package

Technical Field

The utility model relates to the technical field of power batteries, in particular to a cooling structure and a battery pack.

Background

With the rapid development of new energy vehicles, the cruising ability of the power battery is more and more paid extensive attention by consumers. In order to obtain high-performance endurance, the energy density of the battery pack is gradually improved during design, and the internal structure of the battery pack is more compact. And the series of structural designs inevitably bring heat dissipation problems to the battery pack.

In order to accelerate the heat dissipation of the battery pack, a liquid cooling system is generally adopted in the conventional battery pack so as to cool the interior of the battery pack. However, the structure is limited by the structural design defects of the traditional liquid cooling system, which results in increased flow resistance between the inner and outer side channels and increased pressure drop, thus resulting in poor heat dissipation effect.

SUMMERY OF THE UTILITY MODEL

Therefore, a cooling structure and a battery pack are needed to be provided, which are convenient for reducing the flow resistance of a liquid cooling system, reducing the pressure drop of the system and improving the heat dissipation effect.

In a first aspect, the present application provides a cooling structure comprising: the first cooling part is internally provided with a first flow passage and a second flow passage which are arranged in a separated way, the first cooling part is provided with a liquid inlet and a liquid outlet, the liquid inlet is communicated with the first flow passage, and the liquid outlet is communicated with the second flow passage; the second cooling part is positioned outside the first cooling part, a third flow channel is arranged in the second cooling part, at least two connecting pipes which are communicated with the third flow channel are arranged on the second cooling part, at least one connecting pipe is communicated with the first flow channel, and at least one connecting pipe is communicated with the second flow channel.

In the cooling structure, the first cooling element internal flow passage is designed into a first flow passage and a second flow passage which are separated from each other; meanwhile, a second cooling part is arranged outside the first cooling part, at least one connecting pipe is communicated with the first flow passage, and at least one connecting pipe is communicated with the second flow passage, so that the separated first flow passage and the second flow passage are communicated under the action of the second cooling part. Namely, after the cooling liquid is introduced into the liquid inlet, the cooling liquid returns to the second flow channel through the first flow channel and the third flow channel, and is finally discharged from the liquid outlet. This application separates the design with first cooling piece internal flow channel for the coolant liquid can only accomplish the circulation with the help of outside third flow channel, and so design utilizes outside third flow channel to realize that the coolant liquid flows, is convenient for reduce the flow resistance of liquid cooling system, reduces the system pressure drop, thereby is favorable to improving the radiating effect.

In some embodiments, the first flow channel includes a first flow section and a second flow section which are arranged at intervals, and a third flow section which is communicated with the first flow section and the second flow section, the liquid inlet is communicated with the first flow section, and the connecting pipe is communicated with the second flow section. Therefore, the cooling liquid in the first flow channel can sequentially flow through the first flow section, the third flow section and the second flow section before entering the third flow channel, and the cooling liquid is ensured to be fully subjected to heat exchange in the battery pack.

In some embodiments, the number of the third flow sections is at least two, and one end of each of the at least two third flow sections, which is communicated with the first flow section, is located on each of two opposite sides of the first flow section, so that the cooling liquid flows in the cooling structure in a mode of 'two sides enter the middle and return', and the flow resistance of the liquid cooling system is effectively reduced.

In some embodiments, at least a portion of the third flow section extends along an edge of the first cooling element, which is beneficial for increasing the distribution range of the third flow section in the first cooling element, thereby improving the cooling capability of the cooling structure.

In some embodiments, the cooling structure further includes a first joint and a second joint provided on the first cooling element, and the first joint and the second joint are respectively in communication with the liquid inlet and the liquid outlet. So for the coolant liquid steady flow guarantees that cooling structure operation is stable.

In some embodiments, the second cooling element includes a first housing and a second housing covering the first housing, and the third flow passage is formed between the first housing and the second housing. Therefore, the manufacturing of the third flow channel is facilitated to be simplified, and the manufacturing efficiency of the cooling structure is improved.

In some embodiments, at least one first flow guiding portion is disposed on a side surface of the first housing and/or the second housing facing the third flow channel, and the first flow guiding portion is configured to guide the cooling liquid in the third flow channel. Therefore, the cooling liquid in the third flow channel is guided to stably flow, and the larger flow resistance caused by turbulent flow or torrent is reduced, so that the pressure drop of the cooling system is effectively reduced.

In some embodiments, the first flow guide portion is formed by the first housing and/or the second housing being convex toward the third flow channel, and is provided to extend along a flow direction of the cooling liquid in the third flow channel.

In some embodiments, at least one second flow guiding portion is disposed on an inner wall of the first flow channel and/or the second flow channel, and the second flow guiding portion is configured to guide the cooling liquid in the first flow channel or the second flow channel, so as to ensure that the cooling liquid in the first flow channel or the second flow channel stably flows.

In some embodiments, the first cooling member and/or the second cooling member are plate-shaped structures, and can be better arranged in the battery pack than the conventional pipe connection, so that the internal space of the battery pack can be better and effectively utilized.

In a second aspect, the present application provides a battery pack including the cooling structure of any one of the above.

In the battery pack, the cooling structure is adopted, and the internal flow channel of the first cooling part is designed into a first flow channel and a second flow channel which are separated from each other; meanwhile, a second cooling part is arranged outside the first cooling part, at least one connecting pipe is communicated with the first flow passage, and at least one connecting pipe is communicated with the second flow passage, so that the separated first flow passage and the second flow passage are communicated under the action of the second cooling part. Namely, after the cooling liquid is introduced into the liquid inlet, the cooling liquid returns to the second flow channel through the first flow channel and the third flow channel, and is finally discharged from the liquid outlet. This application separates the design with first cooling piece internal flow channel for the coolant liquid can only accomplish the circulation with the help of outside third flow channel, and so design utilizes outside third flow channel to realize that the coolant liquid flows, is convenient for reduce the flow resistance of liquid cooling system, reduces the system pressure drop, thereby is favorable to improving the radiating effect.

Drawings

Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Moreover, like reference numerals are used to refer to like elements throughout. In the drawings:

FIG. 1 is a perspective view of a cooling structure according to some embodiments of the present application;

FIG. 2 is another perspective view of a cooling structure according to some embodiments of the present application;

FIG. 3 is a cross-sectional view of the cooling structure shown in FIG. 1 taken along the direction A-A;

fig. 4 is an enlarged view of the structure at the circle B in fig. 3.

100. A cooling structure; 110. a first cooling member; 111. a first flow passage; 1111. a first flow section; 1112. a second flow section; 1113. a third flow section; 112. a second flow passage; 113. a liquid inlet; 114. a liquid outlet; 115. a third housing; 116. a fourth housing; 117. a second flow guide part; 120. a second cooling member; 121. a third flow path; 122. a first flow guide part; 123. a first housing; 124. a second housing; 125. a connecting pipe; 130. a first joint; 140. a second joint.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural pieces" refers to two or more (including two).

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

At present, the application of the power battery is more and more extensive from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and a plurality of fields such as military equipment and aerospace. With the continuous expansion of the application field of the power battery, the market demand is also continuously expanding.

The inventor notices that when the power battery is cooled and dissipates heat, a bottom cold plate is generally adopted. During cooling, cooling water is introduced into the internal flow channel of the cold plate at the bottom, so that the cooling water flows inside the cold plate to take away heat generated by the operation of the power battery. However, before the cooling water flows out of the bottom cold plate, the cooling water has larger flow resistance, so that the pressure drop of the cooling water during flowing is increased, the flow of the cooling water is reduced, and the cooling effect of the power battery is influenced. In addition, in the long-term past, the heat dissipation demand of power battery can not effectively be satisfied to the cooling water that lets in, can't in time take away the heat, leads to the heat accumulation, causes the power battery to catch fire easily, causes serious threat to user's personal safety.

In order to alleviate the flow resistance of the cooling water flow, the applicant has studied and found that an external flow passage can be designed for the exterior of the bottom cold plate. Specifically, cooling water in the cold plate at the bottom is led out and then returns to the cold plate at the bottom. For example, an external flow channel is arranged outside the bottom cold plate, so that cooling water can flow through the external flow channel when flowing, and the internal flow channel at least one end in the bottom cold plate is replaced, so that the internal flow resistance of the cooling water is reduced. However, after the flow channel is additionally arranged outside, partial flow resistance still exists in the cooling water in the cold plate at the bottom. For example, after cooling water is introduced into the bottom cold plate, part of the cooling water enters the external flow channel, and the other part of the cooling water still flows through the internal flow channel of the whole bottom cold plate, so that the loss of the liquid cooling system along the process is still high.

In view of the above, the inventor of the present invention conducted extensive research to solve the problem of large on-way loss of a liquid cooling system, and designed a cooling structure 100, please refer to fig. 1 and 2, by providing two first flow channels 111 and a second flow channel 112 spaced apart from each other in a first cooling member 110, and providing a second cooling member 120 outside, so that at least one connecting pipe 125 is communicated with the first flow channel 111, and at least one connecting pipe 125 is communicated with the second flow channel 112.

In the cooling structure 100, the first flow channel 111 and the second flow channel 112 are completely disconnected, so that the first flow channel 111 and the second flow channel 112 can only be communicated by the third flow channel 121, and a part of internal flow channels of the first cooling element 110 are completely replaced, thereby facilitating reduction of flow resistance of a liquid cooling system, reducing pressure drop of the system, and being beneficial to improvement of a heat dissipation effect.

In the context of increasing demand for energy density of power batteries, please refer to fig. 1, the second cooling member 120 may be designed as a plate structure to fit the internal space of the battery. Meanwhile, the distance between the second cooling part 120 and the first cooling part 110 can be adjusted according to the actual space inside the battery, such as: the height dimension of the connection pipe 125 is shortened to make the second cooling member 120 closer to the first cooling member 110.

As the heat generation amount of the power battery further increases, the third flow channel 121 may be designed to further increase its width, height, and other structural dimensions, so as to further reduce the flow resistance of the cooling liquid. The cooling liquid may be cooling water, or may be other liquid having a relatively high thermal conductivity.

The cooling structure 100 disclosed in the embodiment of the present application may be, but is not limited to, used in high-power heat generation devices such as power batteries, motors, transformers, and the like. The cooling system can be formed by the cooling structure 100 and the like disclosed by the application, so that the flow resistance of the liquid cooling system is favorably reduced, the pressure drop of the system is reduced, and the heat dissipation effect is improved.

The embodiment of the application provides a battery pack which can be a power battery, a common power supply battery and the like. The common power supply battery can be applied to but not limited to mobile phones, tablets, notebook computers and the like. The power battery can be applied to but not limited to electric toys, electric tools, battery cars, electric automobiles, ships, spacecrafts and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

For convenience of description, the following embodiments take a battery pack as an example of a power battery in an embodiment of the present application.

The battery pack includes a cooling structure 100, a case, and a battery cell. In the battery pack, a plurality of battery monomers can be arranged, the plurality of battery monomers can be connected in series or in parallel or in series-parallel, and the series-parallel connection refers to the series connection and the parallel connection of the plurality of battery monomers. The plurality of battery monomers can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery monomers is accommodated in the box body; of course, the battery pack may also be formed by connecting a plurality of battery cells in series, in parallel, or in series-parallel to form a battery module, and then connecting a plurality of battery cells in series, in parallel, or in series-parallel to form a whole, and accommodating the battery cells in the case. The battery pack may further include other structures, for example, the battery pack may further include a bus member for achieving electrical connection between the plurality of battery cells.

Wherein, each battery cell can be a secondary battery or a primary battery; but is not limited to, a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery. The battery cell can be in a cylinder, a flat body, a cuboid or other shapes.

According to some embodiments of the present application, a cooling structure 100 is provided. With continued reference to fig. 1 and 2, the cooling structure 100 includes: a first cooling element 110 and a second cooling element 120. The first cooling member 110 has a first flow passage 111 and a second flow passage 112 spaced apart from each other, and the first cooling member 110 has a liquid inlet 113 and a liquid outlet 114. The inlet 113 communicates with the first flow passage 111, and the outlet 114 communicates with the second flow passage 112. The second cooling element 120 is located outside the first cooling element 110, and has a third flow channel 121 inside, and at least two connecting pipes 125 both communicating with the third flow channel 121 are disposed on the second cooling element 120. At least one connection pipe 125 communicates with the first flow passage 111, and at least one connection pipe 125 communicates with the second flow passage 112.

The first flow channel 111 being spaced apart from the second flow channel 112 is understood to be: the first flow channel 111 and the second flow channel 112 are disconnected and not communicated, and refer to fig. 2 specifically. As for the specific flow channel between the first flow channel 111 and the second flow channel 112, there are various flow channel designs, such as: the first flow channel 111 and the second flow channel 112 may be, but not limited to, S-shaped back and forth curved design; or in a spiral wound design; or a square flow passage design, etc.

In addition, the distance between the first flow channel 111 and the second flow channel 112 is not particularly limited in this embodiment, and only needs to be able to realize disconnection or non-connection between the two.

The number of the connection pipes 125 between the third flow channel 121 and the first flow channel 111 may be one, two, or more. When more than two connecting pipes 125 are provided between the third flow channel 121 and the first flow channel 111, the flow rate of the cooling liquid in the first flow channel 111 flowing into the third flow channel 121 is increased, which is beneficial to accelerating the flow of the cooling liquid in the cooling system. Also, the number of the connection pipes 125 between the third flow channel 121 and the second flow channel 112 may be one, two, or more. When the third flow channel 121 is communicated with the first flow channel 111 by using more than two connecting pipes 125, more cooling liquid flows out of the third flow channel 121. The cooling liquid may be, but is not limited to, cooling water, cooling oil, or other liquid with high thermal conductivity.

Of course, the connection pipe 125 is disposed far from the liquid inlet 113 at the communication position of the first flow channel 111, so as to prevent the entering cooling liquid from directly entering the third flow channel 121, for example: the connection position of the connection pipe 125 on the first flow passage 111 may be located at an end of the first flow passage 111 away from the liquid inlet 113. And the communication position of the connection pipe 125 on the second flow passage 112 may be disposed adjacent to the liquid outlet 114 to ensure that the cooling liquid in the third flow passage 121 is discharged from the liquid outlet 114 in time.

In order to accelerate the flow of the cooling liquid, the number of the second cooling members 120 may be designed to be one or more. When there are a plurality of second cooling members 120, the plurality of second cooling members 120 are arranged outside the first cooling member 110 in parallel. The second cooling element 120 is disposed outside the first cooling element 110, and can be located on either side of the first cooling element 110, so long as at least one connecting pipe 125 is connected to the first flow passage 111, and at least one connecting pipe 125 is connected to the second flow passage 112, for example: the second cooling member 120 is disposed at a side of the first cooling member 110 facing the battery cells.

The third flow channel 121 can be designed according to the height space inside the battery pack, so that the third flow channel 121 can be widened as soon as possible in order to reduce the flow resistance and the pressure drop. Meanwhile, the inner wall of the third flow channel 121 may adopt a mirror surface or a rounded design to further reduce the flow resistance.

When the cooling liquid is introduced into the liquid inlet 113, the cooling liquid is returned to the second flow channel 112 through the first flow channel 111 via the third flow channel 121, and finally discharged from the liquid outlet 114. The embodiment separates the internal channels of the first cooling element 110, so that the cooling liquid can only complete circulation by means of the external third channel 121, and by such design, the external third channel 121 is utilized to realize the flow of the cooling liquid, thereby facilitating the reduction of the flow resistance of the liquid cooling system, reducing the pressure drop of the system, and being beneficial to the improvement of the heat dissipation effect.

According to some embodiments of the present application, optionally, referring to fig. 1, the first flow channel 111 includes a first flow segment 1111 and a second flow segment 1112 arranged at intervals, and a third flow segment 1113 connected to the first flow segment 1111 and the second flow segment 1112. The inlet 113 communicates with the first flow section 1111 and the connecting tube 125 communicates with the second flow section 1112.

The third flow segment 1113 may take a variety of forms, such as: the third flow segment 1113 may be, but is not limited to, an S-shaped back and forth curved design; or in a spiral wound design; or a square flow passage design, etc. Meanwhile, the number of the third flow segment 1113 may be one or more. A plurality of third flow segments 1113 each communicate between first flow segment 1111 and second flow segment 1112 to increase the flow between first flow segment 1111 and second flow segment 1112 to increase cooling efficiency.

The liquid inlet 113 is arranged on the first flow section 1111, and the connecting pipe 125 is arranged on the second flow section 1112, so that the cooling liquid in the first flow channel 111 can sequentially flow through the first flow section 1111, the third flow section 1113 and the second flow section 1112 before entering the third flow channel 121, and the cooling liquid can be ensured to exchange heat sufficiently in the battery pack.

According to some embodiments of the present application, optionally, referring to fig. 1, the number of the third flow segments 1113 is at least two, and the ends of the at least two third flow segments 1113 communicating with the first flow segment 1111 are located at two opposite sides of the first flow segment 1111, respectively.

One end of the at least two third flow segments 1113 are located on opposite sides of the first flow segment 1111, respectively, and should be understood to be: the cooling liquid in the first flow section 1111 is divided into at least two flows, one flow enters the third flow section 1113 on one side, and the other flow enters the third flow section 1113 on the other side, so that the cooling liquid enters from two sides.

In addition, one ends of the at least two third flow segments 1113 may be distributed in a staggered manner or in an opposed manner in the flow direction of the coolant in the first flow segment 1111. When one ends of at least two third flow segments 1113 are distributed in a staggered manner in the flow direction of the cooling liquid of the first flow segment 1111, a stream of cooling liquid firstly enters the third flow segments 1113 distributed closest to the liquid inlet 113; the other stream of cooling liquid then enters a third flow segment 1113 which is distributed away from the liquid inlet 113.

At least two third flow segments 1113 are respectively communicated with two opposite sides of the first flow segment 1111, so that the cooling liquid introduced from the liquid inlet 113 respectively enters the third flow segments 1113 from two sides; and then converge together in the second flow segment 1112, and enter the third flow channel 121 from the second flow segment 1112. Therefore, the cooling liquid flows in the cooling structure 100 in a mode of 'entering from both sides and returning from the middle', and the flow resistance of the liquid cooling system is effectively reduced.

According to some embodiments of the present application, optionally, referring to fig. 1, at least a portion of the third flow segment 1113 extends along an edge of the first cooling member 110.

The edge of the first cooling element 110 shall mean the edge of the outer contour of the first cooling element 110, i.e. the circumferential edge of the first cooling element 110. The outer contour of the first cooling element 110 can be, but is not limited to, convex, concave, square, trapezoidal, circular, elliptical, etc. When the outer contour of the first cooling element 110 is convex, at least a part of the third flow segment 1113 also extends convexly. Of course, the third flow segment 1113 may include any shape of extension design in addition to a segment extending in a convex shape.

In addition, the shape design of the first cooling element 110 and the second cooling element 120 can be selected from various options, such as: the first cooling element 110 and the second cooling element 120 are both of, but not limited to, plate-like design overall. When the second cooling member 120 is formed in a plate-shaped design, the plate-shaped design can be better arranged, and the inner space of the battery pack can be more effectively utilized, compared with the conventional pipe connection.

At least a portion of the third flow segment 1113 extends along the edge of the first cooling member 110, so that the third flow segment 1113 is reasonably distributed in the first cooling member 110, which is beneficial to increase the distribution range of the third flow segment 1113 in the first cooling member 110, thereby improving the cooling capacity of the cooling structure 100.

According to some embodiments of the present application, optionally, referring to fig. 2, the cooling structure 100 further includes a first joint 130 and a second joint 140 disposed on the first cooling element 110, wherein the first joint 130 and the second joint 140 are respectively in communication with the liquid inlet 113 and the liquid outlet 114.

The connection manner of the first joint 130 and the second joint 140 on the first cooling element 110 can be, but not limited to, threaded socket, snap, rivet, welding, etc. Meanwhile, in order to avoid leakage of the cooling fluid between the first cooling element 110 and the second cooling element 120, the connection pipe 125 needs to be hermetically connected to the first cooling element 110 and the second cooling element 120, respectively. Such as: the connecting pipe 125 is welded to the first cooling member 110 and the second cooling member 120, respectively.

The first connector 130 and the second connector 140 are used for facilitating the external introduction of cooling liquid into the liquid inlet 113; the cooling liquid in the liquid outlet 114 is also convenient to be output to the outside, so that the cooling liquid flows stably, and the cooling structure 100 is ensured to operate stably.

According to some embodiments of the present application, referring to fig. 3 and fig. 4, the second cooling element 120 includes a first housing 123 and a second housing 124 covering the first housing 123. A third flow passage 121 is formed between the first housing 123 and the second housing 124.

The third flow channel 121 is formed between the first housing 123 and the second housing 124, which can be implemented by: the first housing 123 is recessed inside; alternatively, the second housing 124 is recessed inside; alternatively, the inner sides of the first housing 123 and the second housing 124 are both designed to be concave, and the like.

Alternatively, the connection between the first housing 123 and the second housing 124 may be, but is not limited to, bolting, snapping, riveting, welding, pinning, bonding, etc.

The first housing 123 is covered on the second housing 124 to form the third flow channel 121 therebetween, which is beneficial to simplifying the manufacture of the third flow channel 121 and improving the manufacture efficiency of the cooling structure 100.

According to some embodiments of the present application, optionally, referring to fig. 2 and fig. 4, at least one first flow guiding portion 122 is disposed on a side surface of the first casing 123 and/or the second casing 124 facing the third flow channel 121. The first diversion part 122 is used for diverting the coolant in the third flow channel 121.

The first flow guiding portion 122 has a guiding and guiding function for the cooling liquid in the third flow channel 121, and can guide the cooling liquid in a torrent or turbulent state to make the cooling liquid flow stably. The first diversion part 122 may be assembled on the first housing 123 and/or the second housing 124; or may be provided on the first housing 123 and/or the second housing 124 in a unitary structure.

Meanwhile, the number of the first flow guide parts 122 may be one or more. When the first flow guide part 122 is plural, the plural first flow guide parts 122 are arranged on the first housing 123 and/or the second housing 124 at intervals in parallel.

The first flow guiding portion 122 is disposed on the inner side of the first casing 123 and/or the second casing 124, and guides the cooling liquid in the third flow channel 121 to make the cooling liquid flow stably, so as to reduce a large flow resistance caused by turbulence or torrent, thereby effectively reducing a pressure drop of the cooling system.

According to some embodiments of the present application, optionally, referring to fig. 2 and 4, the first flow guiding portion 122 is formed by a first outer shell 123 and/or a second outer shell 124 protruding toward the third flow channel 121, and is configured to extend along a flowing direction of the cooling liquid in the third flow channel 121.

The flow direction of the cooling liquid in the third flow channel 121 is: the flow direction of the coolant from the inlet into the third flow channel 121 to the outlet from the third flow channel 121. The flow direction can be a straight line direction or a curve direction. When the flow direction is curved, the first flow guiding portion 122 extends along the curve of the flow direction.

The first flow guide part 122 is formed by protruding the first housing 123 and/or the second housing 124, so as to simplify the installation process of the first flow guide part 122 in the third flow channel 121 and improve the manufacturing efficiency of the cooling structure 100. Meanwhile, the occupied space of the connection structure between the first flow guide part 122 and the first housing 123 or the second housing 124 is also reduced, and the effective flow space in the third flow channel 121 is increased, so as to improve the cooling capacity of the cooling structure 100.

According to some embodiments of the present disclosure, referring to fig. 2 and 4, at least one second flow guiding portion 117 is disposed on an inner wall of the first flow channel 111 and/or the second flow channel 112. The second flow guide portion 117 is used to guide the coolant in the first flow channel 111 or the second flow channel 112.

The second flow guiding portion 117 has a guiding and guiding function for the cooling liquid in the first flow channel 111 and/or the second flow channel 112, and can guide the cooling liquid in a turbulent flow state to make the cooling liquid flow stably. The second diversion part 117 may be assembled on the inner wall of the first flow channel 111 and/or the second flow channel 112; or may be integrally formed on the inner wall of the first flow passage 111 and/or the second flow passage 112.

Meanwhile, the number of the first flow guide parts 122 may be one or more. When the first flow guiding portion 122 is plural, the plural first flow guiding portions 122 are arranged in parallel at intervals on the inner wall of the first flow channel 111 and/or the second flow channel 112.

The molding design of the first flow channel 111 and the second flow channel 112 may be: the first cooling member 110 includes a third housing 115 and a fourth housing 116 covering the third housing 115. A first flow passage 111 and a second flow passage 112 are formed between the third casing 115 and the fourth casing 116.

The second flow guiding part 117 is arranged on the inner side of the first cooling element 110, and guides the cooling liquid in the first flow passage 111 or the second flow passage 112 to make the cooling liquid stably flow, so that the large flow resistance caused by turbulent flow or torrent flow is reduced, and the pressure drop of the cooling system is effectively reduced.

According to some embodiments of the present application, optionally, referring to fig. 1, the first cooling element 110 and/or the second cooling element 120 are plate-shaped structures.

A plate-like structure is also understood to be a flat structure having two opposite surfaces.

The second cooling member 120 is designed to have a plate-shaped structure, and can be better disposed in the battery pack than the conventional pipe connection, so that the inner space of the battery pack can be better and effectively utilized.

According to some embodiments of the present application, there is also provided a battery pack including the cooling structure 100 of any of the above aspects.

The battery pack may be used in any of the aforementioned powered devices or tools.

Referring to fig. 1 and 2, according to some embodiments of the present application, a flow passage of a multi-layer cold plate is provided, including a first cooling member 110 and a second cooling member 120. The first cooling member 110 and the second cooling member 120 are both designed in a plate shape, and replace the conventional pipe connection, thereby effectively utilizing the internal space of the battery pack. Meanwhile, the first cooling member 110 has a first flow channel 111 and a second flow channel 112 separated from each other, and a liquid outlet 114 and a liquid inlet 113 are provided. The second cooling member 120 is provided with two connection pipes 125. One connecting pipe 125 is connected with the first flow passage 111, the other connecting pipe 125 is connected with the second flow passage 112, and the first flow passage 111 adopts a 'two-side-in-middle-back' arrangement design to reduce the flow resistance of the liquid cooling system.

Claims (10)

1. A cooling structure, comprising:

the first cooling part is internally provided with a first flow passage and a second flow passage which are arranged in a separated way, the first cooling part is provided with a liquid inlet and a liquid outlet, the liquid inlet is communicated with the first flow passage, and the liquid outlet is communicated with the second flow passage;

the second cooling part is positioned outside the first cooling part, a third flow channel is arranged in the second cooling part, at least two connecting pipes which are communicated with the third flow channel are arranged on the second cooling part, at least one connecting pipe is communicated with the first flow channel, and at least one connecting pipe is communicated with the second flow channel.

2. The cooling structure according to claim 1, wherein the first flow passage includes a first flow section and a second flow section which are arranged at an interval, and a third flow section which is communicated with the first flow section and the second flow section, the liquid inlet is communicated with the first flow section, and the connecting pipe is communicated with the second flow section.

3. The cooling structure according to claim 2, wherein the number of the third flow segments is at least two, and ends of at least two of the third flow segments communicating with the first flow segment are located on opposite sides of the first flow segment.

4. The cooling structure of claim 2, wherein at least a portion of the third flow section extends along an edge of the first cooling member.

5. The cooling structure of claim 1, further comprising a first joint and a second joint disposed on the first cooling member, wherein the first joint and the second joint are respectively in communication with the liquid inlet and the liquid outlet.

6. The cooling structure according to claim 1, wherein the second cooling member includes a first housing and a second housing covering the first housing, and the third flow passage is formed between the first housing and the second housing.

7. The cooling structure according to claim 6, wherein at least one first flow guiding portion is disposed on a side surface of the first housing and/or the second housing facing the third flow channel, and the first flow guiding portion is configured to guide the coolant in the third flow channel.

8. The cooling structure according to claim 7, wherein the first flow guide portion is formed by the first outer shell and/or the second outer shell being convex toward the third flow passage, and is provided to extend in a flow direction of the cooling liquid in the third flow passage.

9. The cooling structure according to any one of claims 1 to 8, wherein at least one second flow guide portion is provided on an inner wall of the first flow channel and/or the second flow channel, and the second flow guide portion is configured to guide the cooling liquid in the first flow channel or the second flow channel; and/or the presence of a gas in the gas,

the first cooling element and/or the second cooling element is/are of a plate-like construction.

10. A battery pack, characterized in that the battery pack comprises the cooling structure according to any one of claims 1 to 9.

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